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MLX5DV(7) Miscellaneous Information Manual MLX5DV(7)
mlx5dv - Direct verbs for mlx5 devices
This is low level access to mlx5 devices to perform data path
operations, without general branching performed by
ibv_post_send(3).
The libibverbs API is an abstract one. It is agnostic to any
underlying provider specific implementation. While this
abstraction has the advantage of user applications portability it
has a performance penalty. For some applications optimizing
performance is more important than portability.
The mlx5 direct verbs API is intended for such applications. It
exposes mlx5 specific low level data path
(send/receive/completion) operations, allowing the application to
bypass the libibverbs data path API.
This interface consists from one hardware specific header file
with relevant inline functions and conversion logic from ibverbs
structures to mlx5 specific structures.
The direct include of mlx5dv.h together with linkage to mlx5
library will allow usage of this new interface.
Once an application uses the direct flow the locking scheme is
fully managed by itself. There is an expectation that no mixed
flows in the data path for both direct/non-direct access will be
by same application.
All Mellanox NIC devices starting from Connect-IB (Connect-IB,
ConnectX-4, ConnectX-4Lx, ConnectX-5, ...) implement the mlx5 API,
thus using the mlx5 direct verbs does not limit the applications
to a single NIC HW device thus keeping some level of portability.
ibv_post_send(3), verbs(7), mlx5dv_is_supported(3)
Leon Romanovsky <leonro@mellanox.com>
This page is part of the rdma-core (RDMA Core Userspace Libraries
and Daemons) project. Information about the project can be found
at ⟨https://github.com/linux-rdma/rdma-core⟩. If you have a bug
report for this manual page, send it to
linux-rdma@vger.kernel.org. This page was obtained from the
project's upstream Git repository
⟨https://github.com/linux-rdma/rdma-core.git⟩ on 2025-08-11. (At
that time, the date of the most recent commit that was found in
the repository was 2025-08-04.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
1.0.0 2017-02-02 MLX5DV(7)
Pages that refer to this page: mlx5dv_get_clock_info(3), mlx5dv_init_obj(3), mlx5dv_query_device(3), mlx5dv_ts_to_ns(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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